Zuki: Thanks for your candidly informative input. I was able to play the Korg PA800 at Namm and also discovered 'no glitches' when switching between variations/fills in a style.

Because I suspect Yamaha may not have a Tyros4 OS update fix out until then away, I'll probably wait to see what the next gen Korg arr brings (Jan/Feb?). It would be great if Korg includes new impressive jazz swing/brush drum styles on their upcoming new arr models (suitable for playing acoustic jazz standards). Regarding Touch screens: I like that idea, but only if they can be viewed/navigated in bright/outdoor light. I hope the next gen Korg arrangers will implement the type of touch screen technology used on the Applie iPad because in addition to a capacitive type touch, the screen's bright and easily viewable, even outdoors. - Scott